package org.jeecg.modules.shell.webservcie;

import cn.hutool.extra.ssh.JschUtil;
import cn.hutool.log.Log;
import cn.hutool.log.LogFactory;
import org.springframework.stereotype.Component;

import javax.websocket.*;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.nio.charset.Charset;
import java.util.concurrent.CopyOnWriteArraySet;

/**
 * xterm
 */
@ServerEndpoint("/websocket/{sid}")
@Component
public class XtermWebSocketServer {
	
	static Log log=LogFactory.get(XtermWebSocketServer.class);
    /**静态变量，用来记录当前在线连接数。应该把它设计成线程安全的。*/
    private static int onlineCount = 0;
    /**concurrent包的线程安全Set，用来存放每个客户端对应的MyWebSocket对象。*/
    private static CopyOnWriteArraySet<XtermWebSocketServer> webSocketSet = new CopyOnWriteArraySet<XtermWebSocketServer>();

    /**与某个客户端的连接会话，需要通过它来给客户端发送数据 */
    private Session session;

    //接收sid
    private String sid="";

    private com.jcraft.jsch.Session jschSession;

    /**
     * 连接建立成功调用的方法*/
    @OnOpen
    public void onOpen(Session session,@PathParam("sid") String sid) {
        this.session = session;
        this.jschSession= JschUtil.getSession("127.0.0.1", 22, "root", "123456");
        /** 加入set中*/
        webSocketSet.add(this);
        addOnlineCount();
        log.info("有新窗口开始监听:"+sid+",当前在线人数为" + getOnlineCount());
        this.sid=sid;
        try {
        	 sendMessage("连接成功");
        } catch (IOException e) {
            log.error("websocket IO异常");
        }
    }

    /**
     * 连接关闭调用的方法
     */
    @OnClose
    public void onClose() {
        webSocketSet.remove(this);
        subOnlineCount();
        log.info("有一连接关闭！当前在线人数为" + getOnlineCount());
    }

    /**
     * 收到客户端消息后调用的方法
     *
     * @param message 客户端发送过来的消息*/
    @OnMessage
    public void onMessage(String message, Session session) {
    	log.info("收到来自窗口"+sid+"的信息:"+message);
        //群发消息
        for (XtermWebSocketServer item : webSocketSet) {
            try {
                item.sendMessage(JschUtil.exec(jschSession, message, Charset.defaultCharset()));
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

	/**
	 * 
	 * @param session
	 * @param error
	 */
    @OnError
    public void onError(Session session, Throwable error) {
        log.error("发生错误");
        error.printStackTrace();
    }
	/**
	 * 实现服务器主动推送
	 */
    public void sendMessage(String message) throws IOException {
        this.session.getBasicRemote().sendText(message);
    }


    /**
     * 群发自定义消息
     * */
    public static void sendInfo(String message,@PathParam("sid") String sid) throws IOException {
    	log.info("推送消息到窗口"+sid+"，推送内容:"+message);
        for (XtermWebSocketServer item : webSocketSet) {
            try {
            	//这里可以设定只推送给这个sid的，为null则全部推送
            	if(sid==null) {
            		item.sendMessage(message);
            	}else if(item.sid.equals(sid)){
            		item.sendMessage(message);
            	}
            } catch (IOException e) {
                continue;
            }
        }
    }

    public static synchronized int getOnlineCount() {
        return onlineCount;
    }

    public static synchronized void addOnlineCount() {
        XtermWebSocketServer.onlineCount++;
    }

    public static synchronized void subOnlineCount() {
        XtermWebSocketServer.onlineCount--;
    }
}

